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import java.io.BufferedReader; import java.io.IOException; import
java.io.InputStreamReader; public class Main { public static void main(String[]
args) throws IOException { // TODO Auto-generated method stub BufferedReader
reader=new BufferedReader(new InputStreamReader(System.in)); String str;
while((str=reader.readLine())!=null) { char[] temp=str.toCharArray(); char
temp1=temp[3]; temp[3]=temp[0]; temp[0]=temp1; char temp2=temp[2];
temp[2]=temp[1]; temp[1]=temp2; String out=new String(temp);
System.out.println(out); } } }
常规题，而且四位字符降低了难度。其实这道题对我而言最大的收获是终于明白了“
题目可能包含多组用例
”
这句话究竟是什么意思？
每次看到题目给的测试用例长这样时：
我都以为自己写代码在编译器测试时需要输入好几行，但是每次换行一按“Enter”键，输出就出来了，根本没办法输入好几行测试用例，然后再一次性输出。直到今天，一个偶然的情况，我在输入一行得到输出后，又按了几个字符，发现它自动换行显示了！这样就达到了题目所说的要求了！
真是要被自己一直以来给蠢哭了，不过好歹算是后知后觉了
